FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil industry, namely to the compositions for the acid treatment of the bottomhole zone of carbonate and terrigenous (carbonate content of more than 5 %) formations, and can be used in the process of intensification of oil inflow and development of wells by acid treatment, as well as increasing the oil recovery of reservoirs by hydraulic fracturing with the use of acidic compounds. Acid composition for treatment of the bottomhole formation zone contains, by mass%: acetic acid with a concentration of 99 % 3.5–5; non-ionic surfactant Neonol AF 9–12 0.1–0.3; isopropyl alcohol or glycerol 4–6; An aqueous solution of hydrochloric acid with a concentration of 10–14 % rest.
EFFECT: prevention of formation of oil-acid emulsions, reduction of interfacial tension on the border with oil, while eliminating the formation of jelly-containing stabilizers of oil emulsions and swelling of clay minerals.
1 cl, 1 dwg
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